Monica, I swear by TechSmith's SnagIt:
www.techsmith.com
You can trial it if you like.
You can set hotkeys so that you can hit dropdowns and still capture them,
etc...
Otherwise, Shift+PrintScreen should work to grab the whole screen, and
Alt+PrintScreen to get just the active window.
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Hope it helps!
Anne Troy
www.OfficeArticles.com